Wheel speed sensor having multiple sensing units and wheel bearing comprising same

Abstract

A wheel speed sensor mounted on a wheel bearing to detect a rotational speed of a wheel is provided. The wheel speed sensor according to an embodiment of the present disclosure may comprise: a housing having a sensing module provided therein; a first sensing module configured to detect a rotational speed of the wheel and to output a first detection signal to an outside; and a second sensing module configured to detect a rotational speed of the wheel independently of the first sensing module and to output a second detection signal to the outside. According to an embodiment of the present disclosure, the first sensing module may comprise a first sensing part configured to detect a rotational speed of the wheel, and the second sensing module may comprise a second sensing part configured to detect a rotational speed of the wheel.

What is claimed is: 
     
       1. A wheel speed sensor mounted on a wheel bearing to detect a rotational speed of a wheel, comprising:
 a housing; 
 a first sensing module configured to detect a rotational speed of the wheel and to output a first detection signal to an outside; and 
 a second sensing module configured to detect the rotational speed of the wheel independently of the first sensing module and to output a second detection signal to the outside, 
 wherein the first sensing module comprises a first sensing part configured to detect a rotational speed of the wheel, and the second sensing module comprises a second sensing part configured to detect the rotational speed of the wheel, 
 wherein the housing includes a housing body portion formed in a cylindrical cap shape with one side opened and a connector part positioned on one side of the housing body portion; 
 the first sensing part and the second sensing part include a sensor disposed adjacent to a sensor target mounted on a rotary element of the wheel bearing and configured to sense a change in magnetic field and a plurality of lead terminals extending from the sensor; 
 the first sensing module further includes a first terminal portion electrically connected to the first sensing part, and the second sensing module further includes a second terminal portion electrically connected to the second sensing part; and 
 the first sensing module and the second sensing module are provided in the housing, and the first sensing module and the second sensing module are separated from each other in a circumferential direction of the housing, and 
 wherein the first sensing part of the first sensing module is accommodated in a first insert body; 
 the second sensing part of the second sensing module is accommodated in a second insert body; 
 the first insert body and the second insert body are formed separately from each other; and 
 the first sensing module and the second sensing module are configured such that end portions thereof are exposed to the outside through one connector part formed in the housing. 
 
     
     
       2. The wheel speed sensor of  claim 1 , wherein the sensor provided in each of the first sensing part and the second sensing part comprises any one of a Hall sensor, an anisotropic magneto-resistance (AMR) sensor, and a giant magneto-resistance (GMR) sensor. 
     
     
       3. The wheel speed sensor of  claim 1 , wherein the first sensing module further comprises a first terminal portion electrically connected to the first sensing part, and
 the second sensing module further comprises a second terminal portion electrically connected to the second sensing part. 
 
     
     
       4. The wheel speed sensor of  claim 3 , wherein each of the first terminal portion and the second terminal portion comprises a power terminal and a signal terminal, and
 any one lead terminal of a plurality of lead terminals provided in each of the first sensing part and the second sensing part is electrically connected to the power terminal provided in each of the first terminal portion and the second terminal portion, and the other lead terminal of the plurality of lead terminals provided in each of the first sensing part and the second sensing part is electrically connected to the signal terminal provided in each of the first terminal portion and the second terminal portion. 
 
     
     
       5. A wheel bearing comprising:
 the wheel speed sensor of  claim 1 . 
 
     
     
       6. The wheel bearing of  claim 5 , wherein the wheel bearing is configured to rotatably support the rotary element on which the wheel is mounted relative to a non-rotary element connected to a vehicle body through rolling bodies. 
     
     
       7. The wheel bearing of  claim 6 , wherein the wheel speed sensor is mounted on and fixed to the non-rotary element connected to the vehicle body. 
     
     
       8. The wheel bearing of  claim 7 , further comprising:
 a sensor target mounted on the rotary element of the wheel bearing to generate a change in magnetic field while rotating together with the wheel.